1    package npw;
2    import painter.SPainter;
3    import shapes.SCircle;
4    import shapes.SSquare;
5    
6    import javax.swing.*;
7    import java.awt.*;
8    import java.util.Random;
9    import java.util.Scanner;
10   
11   public class CircleOfSquares {
12       private void paintTheImage(){
13           int radius = getNumber("circle radius");
14           int side = getNumber("square side length");
15   
16           SPainter painter = new SPainter("Circle of Squares", radius*2+50, radius*2+50);
17           painter.setBrushWidth(3);
18           SCircle circle = new SCircle(radius);
19           SSquare square = new SSquare(side);
20   
21           paintCircleOfSquares(painter, circle, square);
22       }
23   
24       private void paintCircleOfSquares(SPainter painter, SCircle circle, SSquare square){
25   
26           painter.mfd(circle.radius());
27           painter.tr();
28   
29           double moved = 0;
30           while (moved < circle.diameter()) {
31               double chord = chordLength(circle.radius() - moved, circle);
32               int squares = squaresOnLineCount(chord, square.side());
33               paintRow(painter, square, squares);
34               nextRow(painter, square.side());
35               moved = moved + square.side();
36           }
37   
38           painter.tl();
39           painter.mfd(circle.radius());
40       }
41   
42   
43       private void nextRow(SPainter painter, double rowHeight){
44           painter.tr();
45           painter.mfd(rowHeight);
46           painter.tl();
47       }
48   
49   
50       private void paintRow(SPainter painter, SSquare square, int squaresToPaint){
51   
52           double centerOffset = ( (squaresToPaint * square.side()) / 2) - square.side()/2;
53           painter.mbk(centerOffset);
54   
55   
56           int painted = 0;
57           while (painted < squaresToPaint){
58               paintOneSquare(painter, square);
59               painter.mfd(square.side());
60               painted = painted + 1;
61           }
62   
63   
64           painter.mbk(centerOffset + square.side());
65       }
66   
67       private void paintOneSquare(SPainter painter, SSquare square){
68           painter.setColor(randomColor());
69           painter.paint(square);
70           painter.setColor(Color.BLACK);
71           painter.draw(square);
72       }
73   
74       private static int squaresOnLineCount(double lineLength, double sideLength){
75           int squares = ( (int)Math.ceil( ( lineLength - sideLength ) / sideLength ) + 1);
76           return squares;
77       }
78   
79       private double chordLength(double yOffset, SCircle circle){
80           double xLength = Math.sqrt(Math.pow(circle.radius(), 2) - Math.pow(yOffset, 2));
81           double chordLength = xLength * 2;
82           return chordLength;
83       }
84   
85       private static int getNumber(String prompt) {
86           String nss = JOptionPane.showInputDialog(null,prompt+"?");
87           Scanner scanner = new Scanner(nss);
88           return scanner.nextInt();
89       }
90   
91       private static Color randomColor() {
92           Random rgen = new Random();
93           int r = rgen.nextInt(256);
94           int g = rgen.nextInt(256);
95           int b = rgen.nextInt(256);
96           return new Color(r,g,b);
97       }
98   
99       public CircleOfSquares() {
100          paintTheImage();
101      }
102  
103      public static void main(String[] args) {
104          SwingUtilities.invokeLater(new Runnable() {
105              public void run() {
106                  new CircleOfSquares();
107              }
108          });
109      }
110  }
111